Uniflair UST500, Инструкция по эксплуатации

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UST500 CONTROL BOARD
60 06MC0074@00B0100
14/04/2010
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28,3
27,7
1
2
79,35
-28, 35
-1
Adaptive (folder PAr/Ad)
Chillers generally contain a water accumulation tank.
The purpose of these tanks is to create sufficient thermal inertia to stop the compressor from repeatedly switching on and off in
periods in which the temperature requirements in the area to be cooled are relatively few (switching repeatedly on and off will reduce
the life time of compressors).
A water accumulator increases the thermal capacity and provides the inertia required to extend running time. Nevertheless, water
accumulation is also a substantial cost and also adds to the minimum dimensions of the machine.
Adaptive function parameters can be viewed and configured in the Ad folder (see chapters on User Interface and Parameters).
Operating modes
By adjusting the setpoint and hysteresis, the Adaptive function simulates electronically the inertia of a water accumulator, meaning it can be
used less.
Parameter Description 0 1 2
Ad00
Enable machine function
without accumulation
Accumulator
disabled
Accumulator
enabled
//
Ad01
Accumulation offset type
Setpoint Hysteresis
Se
hysteresis
MT minimum time and ET real time
Note that compressor on/off times must respect safety time delays:
The function analyses actual running time of the compressor (ET) comparing it with the preset minimum running time (MT).
The minimum time (MT) is set in parameter Ad07 - Reference compressor on time for adaptive accumulation
offset Parameter Description
Ad07
Reference compressor on time for accumulation offset
Real running time (ET) is recorded automatically by the device
Type of plant ET
2 compressors /
Partialized
compressor
Count
[first compressor on / first partialization, last resource switched off]
Ordinary
compressor
Count
[compressor on, compressor off)
Adaptive function with setpoint modification
If ET<MT:
when the compressor switches off, the operating setpoint is changed to a value equal to the adaptive
offset (AO) according to the formula below:
•
AO=((MT – ET)* Ad02)/10 + Ad03
COOLING MODE
•
ET<MT example
If the real running time (ET) is less than the minimum time (MT), each time the compressor switches off, the adaptive offset is subtracted
from the setpoint.
Cycle 0:
•
Setpoint for cycle 0: SET(0) = SET (COOL)
•
Hysteresis for cycle 0: ISTERESI (0) = ISTERESI (COOL)
•
Compressor ON: SET (0)+HYSTERESIS (0) ---> SET (COOL) +HYSTERESIS (COOL)**
•
Compressor OFF: SET (0)
Cycle 1:
•
Setpoint for cycle 1: SET(1) = SET (0) – AO(1) = SET(COOL)-AO(1)
•
Compressor ON: SET (0)+HYSTERESIS (0) ---> SET (COOL) +HYSTERESIS (COOL)**
•
Compressor OFF: SET (0) – AO(1) = SET (COOL)** – AO(1)
Cycle 2:
•
Setpoint for cycle 2: SET(2) = SET (1) – AO(2)
•
Compressor ON: SET (0)+HYSTERESIS (0) ---> SET (COOL) +HYSTERESIS (COOL)**
•
Compressor OFF: SET (0) – AO(2) = SET (COOL)** – AO(2)
Minimum time
MT
Real time
ET
ET<MT example